An anhydrous denatured aliphatic alcohol intended for gasoline blending as
described in Oxygenates definition.

Gasoline Treated as Blendstock (GTAB)

Non-certified Foreign Refinery gasoline classified by an importer as blendstock to be either blended or reclassified with respect to reformulated or conventional gasoline. GTAB was classified on EIA surveys as either reformulated or conventional based on emissions performance and the intended end use in data through the end of December 2009. Designation of GTAB as reformulated or conventional was discontinued beginning with data for January 2010. GTAB was reported as a single product beginning with data for January 2010. GTAB data for January 2010 and later months is presented as conventional motor gasoline blending components whenreported as a subset of motor gasoline blending components.

Isobutane (C4H10)

A normally gaseous branch-chain hydrocarbon. It is a colorless paraffinic gas that boils at a
temperature of 10.9º F. It is extracted from natural gas or refinery gas streams.

Liquefied Refinery Gases (LPG)

Liquefied petroleum gases fractionated from refinery or still gases. Through compression
and/or refrigeration, they are retained in the liquid state. The reported categories are
ethane/ethylene, propane/propylene, normal butane/butylene, and isobutane/isobutylene.
Excludes still gas.

Methanol

Blends of methanol and gasoline-grade tertiary butyl alcohol (GTBA) such that the total
oxygen content does not exceed 3.5 percent by weight and the ratio of methanol to GTBA is
less than or equal to 1. It is also specified that this blended fuel must meet ASTM volatility
specifications (commonly referred to as the "AARCO" waiver).

Blends of up to 5.0 percent by volume methanol with a minimum of 2.5 percent by volume
cosolvent alcohols having a carbon number of 4 or less (i.e., ethanol, propanol, butanol,
and/or GTBA). The total oxygen must not exceed 3.7 percent by weight, and the blend must meet
ASTM volatility specifications as well as phase separation and alcohol purity specifications
(commonly referred to as the "DuPont" waiver).

Naphthas (e.g., straight-run gasoline, alkylate, reformate, benzene, toluene, xylene) used for
blending or compounding into finished motor gasoline. These components include reformulated
gasoline blendstock for oxygenate blending (RBOB) but exclude oxygenates (alcohols, ethers),
butane, and pentanes plus. Note: Oxygenates are reported as individual components and are
included in the total for other hydrocarbons, hydrogens, and oxygenates.

MTBE (Methyl tertiary butyl ether)

An ether intended for gasoline blending as described in "Oxygenates."

Natural Gas Liquids

Those hydrocarbons in natural gas that are separated from the gas as liquids through the process
of absorption, condensation, adsorption, or other methods in gas processing or cycling plants.
Generally such liquids consist of propane and heavier hydrocarbons and are commonly referred
to as lease condensate, natural gasoline, and liquefied petroleum gases. Natural gas liquids
include natural gas plant liquids (primarily ethane, propane, butane, and isobutane;
see Natural Gas Plant Liquids) and lease condensate (primarily pentanes produced from
natural gas at lease separators and field facilities; see Lease Condensate).

Natural Gas Plant Liquids

Those hydrocarbons in natural gas that are separated as liquids at natural gas processing
plants, fractionating and cycling plants, and, in some instances, field facilities.
Lease condensate is excluded. Products obtained include ethane; liquefied petroleum
gases (propane, butanes, propane-butane mixtures, ethane-propane mixtures); isopentane;
and other small quantities of finished products, such as motor gasoline, special naphthas,
jet fuel, kerosene, and distillate fuel oil.

Normal Butane (C4H10)

A normally gaseous straight chain hydrocarbon that is a colorless paraffinic gas which boils at a
temperature of 31.1 degrees Fahrenheit.

Fuel Ethanol: Blends of up to 10 percent by volume anhydrous ethanol (200 proof) (commonly referred to as the
"gasohol waiver").

Methanol: Blends of methanol and gasoline-grade tertiary butyl alcohol (GTBA) such that the total oxygen content
does not exceed 3.5 percent by weight and the ratio of methanol to GTBA is less than or equal to 1. It is also
specified that this blended fuel must meet ASTM volatility specifications (commonly referred to as the "ARCO"
waiver).
Blends of up to 5.0 percent by volume methanol with a minimum of 2.5 percent by volume cosolvent alcohols having a carbon number of 4 or less (i.e., ethanol, propanol, butanol, and/or GTBA). The total oxygen must not exceed 3.7 percent by weight, and the blend must meet ASTM volatility specifications as well as phase separation and alcohol purity specifications (commonly referred to as the "DuPont" waiver).

MTBE (Methyl tertiary butyl ether): Blends up to 15.0 percent by volume MTBE which must meet the ASTM D4814
specifications. Blenders must take precautions that the blends are not used as base gasolines for other
oxygenated blends (commonly referred to as the "Sun" waiver).

Pentanes Plus

A mixture of hydrocarbons, mostly pentanes and heavier, extracted from natural gas.
Includes isopentane, natural gasoline, and plant condensate.

Petroleum Administration for Defense (PAD) Districts

Geographic aggregations of the 50 States and the District of Columbia into five districts
by the Petroleum Administration for Defense in 1950. These districts were originally defined
during World War II for purposes of administering oil allocation.
Description and maps of PAD Districts and Refining Districts.

RBOB for Blending with Alcohol

Motor gasoline blending components intended to be blended with an alcohol component (e.g., fuel ethanol) at a terminal or refinery to raise the oxygen content. RBOB product detail by type of oxygenate was discontinued effective with data for January 2010. Beginning with data for January 2010, RBOB was reported as a single product.

RBOB for Blending with Ether

Motor gasoline blending components intended to be blended with an ether component (e.g., methyl tertiary butyl ether) at a terminal or refinery to raise the oxygen content. RBOB product detail by type of oxygenate was discontinued effective with data for January 2010. Beginning with data for January 2010, RBOB was reported as a single product.